3D Parametric Modeling ProENGINEER Chapter 5 Datums

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3D Parametric Modeling Pro/ENGINEERChapter 5
Datums

• Datums (Page 5-2)
• Datums are imaginary features that assist in the
  construction of models.
• The default datums are Front, Top, and Right.
• Datums other than the default datums are
  necessary to create on complex parts.
• Datum Planes (Page 5-5)
• Used as sketching planes for creating sketches
• Act as reference planes for sketching
• Used as references for placing holes, mirroring
  features, copying features, etc.

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Datums

• Datums (Page 5-5)
• Create a datum by selecting InsertgtModel
  DatumgtPlane or click on the Datum Plane on the
  Datum toolbar.
• The Datum Plane box will appear.

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• Datums (Page 5-7)
• When you select a feature of the model its name
  will appear in the References section of the
  Datum Plane dialogue box.
• This will indicate the new sketch plane for the
  next feature.

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Datums

• Datums (Page 5-7)
• The Display tab can be selected to Flip the
  direction of the new plane. Flip the direction
  in the direction you want the protrusion to be
  created.

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Datums

• Datums (Page 5-7)
• The Properties tab is used to rename the new
  datum plane.

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• Datums (Page 5-8)
• The Datum Plane constraints.

Constraints
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Datums

• Datums (Page 5-8)
• The Datum Plane constraints.
• Through Creates a datum through an axis, edge,
  curve, point/vertex, plane, cylinder.
• Select the first plane, edge, axis
• or cylinder.
• Hold down on CTRL and select
• the next edge or axis.

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• Datums (Page 5-8)
• The Datum Plane constraints.
• Through

Through Edges
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Datums

• Datums (Page 5-8)
• The Datum Plane constraints.
• Through

Through Vertices
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Datums
The Normal constraint is used to create a datum
plane normal to any specified axis, edge, curve,
or plane. The possible combinations of datum
plane creation are referred to as Yes and the
combinations that are not possible are referred
to as No in the table.
Page (5-9)
Datum plane constraints combinations using the
Normal constraint
Selecting a planar surface and a cylindrical
surface
Resultant datum plane
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Datums

• Datums (Page 5-11)
• The Datum Plane constraints.
• Parallel Creates a datum plane parallel to any
  specified datum plane or face.

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Datums

• Datums (Page 5-12)
• The Datum Plane constraints.
• Offset - Creates a datum plane offset a distance
  from a selected plane.
• Notice the offset value
• in the DATUM PLANE
• box.

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Datums

• Datums (Page 5-12)
• The Datum Plane constraints.
• Offset Create an angled sketch plane by
  selecting the plane (Shown in red) and then
  selecting the edge. The new plane will go
  through the edge at the specified angle.

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Datums

• Datums (Page 5-13)
• The Datum Plane constraints.
• Tangent Reference a cylinder to create a
  tangent constraint.

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Datums

• Datums (Page 5-14)
• Datum Planes On-The-Fly
• Choose the Extrude Tool
• Choose the Placement button and Define button.
• Pick the Datum Plane Tool from the Datum toolbar.
• Select the Face or Datum Plane to be the sketch
  plane.
• Select the references and constraints to create
  the datum plane and select OK.
• Select Sketch from the Sketch dialogue box.
• You will go into the sketch mode to complete the
  sketch.

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Datums

• Datums (Page 5-15)
• Datum Axes
• Used for cylindrical features.
• Can be used as a reference for feature creation.
• Used when placing features co-axially.
• Used to create radial patterns.
• Create a Datum Axes much like the planes.
• Select a planar face and use the Normal
  constraint for the Reference.
• Pick two adjacent edges for the offset references

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Datums

• Datums (Page 5-20)
• Datum Points
• Imaginary points created to assist the creation
  of a model.
• Used to create datum planes and axes.
• To associate notes in the drawings and attach
  datum targets.
• ON option will create a datum point on a face or
  a datum plane.
• OFFSET creates a datum point at an offset
  distance from a specified face or a datum plane
  in a specified direction

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• Creating Cuts (Page 5-27)

The Cut is a material removal process and this
option is available only when at least a base
feature exists on the graphics window. The tool
that creates the cut is available on the
dashboard of the feature creation tool.

• Removing a Material by Extruding a Sketch

The Extrude Cut is used to create an extruded
feature by removing material from an existing
feature. The material that is removed is defined
by the sketch you draw.
Cut feature created on the selected plane
Sketch for the extrude cut and the arrow showing
the direction of material removal
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Datums

• Creating Cuts (Page 5-28)

• Removing Material by Revolving a Sketch

The Revolve Cut is a revolved feature that is
created by removing material from an existing
feature. The material that is removed is defined
by the sketch you draw. Remember that the center
line is necessary in the revolve features.
The sketch of the revolve cut
Revolve cut created
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Datums
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• Assignments
• Tutorial 1, Page 5-29
• Tutorial 2, Page 5-39
• Tutorial 3, Page 5-47
• Review Questions, Page 5-54
• Exercise 1, Page 5-55
• Exercise 2, Page 5-56